/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.everrest.core;

/**
 * Implementation of DependencySupplier should be able to provide objects that
 * required for constructors or fields of Resource or Provider.
 *
 * @author <a href="mailto:andrey.parfonov@exoplatform.com">Andrey Parfonov</a>
 * @version $Id$
 */
public interface DependencySupplier {
    /**
     * Get object that is approach do description <code>parameter</code>.
     *
     * @param parameter
     *         required parameter description
     * @return object of required type or null if instance described by
     *         <code>parameter</code> may not be produced
     * @throws RuntimeException
     *         if any error occurs while creating instance
     *         described by <code>parameter</code>
     * @see Parameter#getParameterClass()
     * @see Parameter#getGenericType()
     */
    Object getComponent(Parameter parameter);

    /**
     * Get instance of <code>type</code>.
     *
     * @param type
     *         required parameter class
     * @return object of required type or null if instance described by
     *         <code>type</code> may not be produced
     * @throws RuntimeException
     *         if any error occurs while creating instance
     *         of <code>type</code>
     */
    Object getComponent(Class<?> type);
}
